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# frozen_string_literal: true
##
# Outputs RDoc markup with hot backspace action! You will probably need a
# pager to use this output format.
#
# This formatter won't work on 1.8.6 because it lacks String#chars.
class RDoc::Markup::ToBs < RDoc::Markup::ToRdoc
##
# Returns a new ToBs that is ready for hot backspace action!
def initialize markup = nil
super
@in_b = false
@in_em = false
end
##
# Sets a flag that is picked up by #annotate to do the right thing in
# #convert_string
def init_tags
add_tag :BOLD, '+b', '-b'
add_tag :EM, '+_', '-_'
add_tag :TT, '', '' # we need in_tt information maintained
end
##
# Makes heading text bold.
def accept_heading heading
use_prefix or @res << ' ' * @indent
@res << @headings[heading.level][0]
@in_b = true
@res << attributes(heading.text)
@in_b = false
@res << @headings[heading.level][1]
@res << "\n"
end
##
# Prepares the visitor for consuming +list_item+
def accept_list_item_start list_item
type = @list_type.last
case type
when :NOTE, :LABEL then
bullets = Array(list_item.label).map do |label|
attributes(label).strip
end.join "\n"
bullets << ":\n" unless bullets.empty?
@prefix = ' ' * @indent
@indent += 2
@prefix << bullets + (' ' * @indent)
else
bullet = type == :BULLET ? '*' : @list_index.last.to_s + '.'
@prefix = (' ' * @indent) + bullet.ljust(bullet.length + 1)
width = bullet.length + 1
@indent += width
end
end
##
# Turns on or off regexp handling for +convert_string+
def annotate tag
case tag
when '+b' then @in_b = true
when '-b' then @in_b = false
when '+_' then @in_em = true
when '-_' then @in_em = false
end
''
end
##
# Calls convert_string on the result of convert_regexp_handling
def convert_regexp_handling target
convert_string super
end
##
# Adds bold or underline mixed with backspaces
def convert_string string
return string unless @in_b or @in_em
chars = if @in_b then
string.chars.map do |char| "#{char}\b#{char}" end
elsif @in_em then
string.chars.map do |char| "_\b#{char}" end
end
chars.join
end
end
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